Blanket holder for printing cylinders



March 13, 1928. 1,662,284

F. B. SHEA BLANKET HOLDER FOR PRINTING CYLINDERS 1! Filed March 17. 1927J (P/tank 53.5%

IN V EN TOR.

flu ATTORNEY Patented Mar. 13, 1928.

UNITED STATES 1,562,284 P TENT ()FFIEE,

FRANK B. SHEA, 01F BROOKLYN, NEW YORK.

BLANKET HOLDER: FOR PRINTING CYLINDERS.

Application filed March 17, 1927. Serial No. 175,951.

My invention relates to blanket holders for printing, cylinders and hasfor its object to provide a holder which will subtract a. very smallarea from the printing surface of the cylinder and at the same timeprovlde a simple, efficient and readily accessible securmg means.

As is well known, certain cylinders of printing presses are covered withblankets which must be stretched tightly about the surfacev of. thecylinder; Heretofore the means for securinga blanket, to a cylinder havetaken up an excessive area of the cylinder, surface. This arearepresents a total loss of printing surface and results in the wideblank spaces on the printed sheet. In the case of' a. large web presswith its many impression cylinders and through.

which large quantities of paper are passed, the space lost by theholding means amounts to a. large total which adds materially to theexpense of the output.

Heretofore in order: to reduce this space to a minimum accessibility ofthe holding means has had to be sacrificed. It is an object of myinvention to provide a. holding means which will reduce waste space onthe cylinder without sacrificing accessibillty.

Another object of my invention is to pro vide a blanket holder whichmaybe readily applied toor removed from acylinder.

\Vith these and otherobjects in view which will appear hereinafter Ishall now describe a preferred embodiment of my invention. and point outthe novelty and scope my invention inthe appended claims.

In the accompanying, drawing, Figure 1. is a view in cross-section ofaprinting cylinder provided, with my improved blanket, holder, thesection being taken on a line 1-l of Fig. 3.

Fig; 2 is a view in. section similar to Fig. 1, but showing my improvedholder in a different-position; and

Fig. Sis aside view of aprinting cylinder partly broken away along theline 33 of Fig. 1 to illustrate my improved blanket holder in. sideelevation.

In the accompanying drawings 1 have used the reference numeral '10;todesignate a printing cylinder. A notch 11 iscut in the face ofthecylinder parallel. to the cylinder axis. (Dne Wall 12, of the notchis preferablyradial to the cylinder.. Bearing against the wall 12 is aplate 13 which is held in place by means of headed pins 14;. The

latter pass through slots 15 inthe plate 13. if desired the pins 1d maybethreaded' into the wall 12, but I'prefer to attach them to a. rail 16wl' ich is seated in an undercut longitudinal slot 17 formed in the wall12. The slot a 1d the railv are preferably of dove-tail in crosssection, so that the rail will be lockedfagainst lateral movement, butmay slide endwise in the slot. Theouter end of the rail 16 carries a lug18 through which a screw 1%) is passed and threaded into the cylinder,thereby locking the rail and'the pins it carries to the cylinder. I

Secured to the plate 13 at suitable intervals by means of straps 20 aresprings 21; These springs are preferably ofrectangular cross-section sothat theywillnot turn in the straps 20. The springs are ofinverted lishape with the free ends curved outwardly and forming feet 22 whichengage a slot in the bottom of the notch 11. 5 The springs 21 tend tohold the plate 13 in the raised position shown in Figures 1' and 3, andin this position the pins lat engage the bottoms of thesl'ots 15. Whenthe plate 13' is in a raised position it projects from theperipheralface of the cylinder sothat hooks 2e, projecting from the exposed faceof the plate 1'3, are readily accessible. A blanket 25 is coiled aboutaroller 26 lying within the notch 11 and passes around the cylinder 10with its free end engaging the pins 24. It will be observed that theslots 15' are of bayonet form comprising in each case a vertical portionterminatingat the outer endin a lateral offset 27. The offsets 27 arerounded at the bottom to provide seats for the pins 14- and at thejuncture of these rounded bottoms withthe vertical portions of the slotsthere are slightly raised points or slioulders 28. depressed so that itsouter edge lies slightly below the peripheral face of the cylinder 10the plate may be moved laterally to permit the pinsto enter the offsets27. Then on releasing the'plate the springsiZl will raise the plate, sothat its outer edge lies flush with the peripheral face of the cylinder,and the shoulders QS W lllllOld the pins in the o'll'sets 27 preventingendwise movement of the plate. a e

At one end of the plate 13 there is a pro- 'jection or car 29 which ispreferably rounded at the lower edge thereof. I Mounted'on the wall 12is a spring 30 which is downwardly curved in the path of the projection29.

Thus when the plate 13 is Thus, when the plate 13 is depressed therounded edge of the car 29 engages the spring 230 and the latter pressesthe plate 13 cndwisc, so that as soon as the pins it clear the shoulders2d the plate 13 will be auto matically moved endwise, permitting thepins to enter the otlsets QTand loclr the plate in depressed position.

In practice whenever it is desired to attach or detach a blanket l'romthe cylinder the plate 13 is slightly depressed and moved endwiseagainst. the tension of spring 30 to permit the pins 12 to clear theoli'sets 2T, whereupon the springs 21 will force the plate l3 outward tothe position shown in Figures 1 and The end of a blanket may then beattached to or detached from the hooks which now are in a position oi?ready accessibility. After a blanket has been attached to the plate andthe plate is forced down into the notch 11 the spring no willautomatically push it endwise in position to be locked by engagement olthe pins it with the Ollsets 2T. 'lfhercalter the take-up roller 26 isturned to take up any :ilttt'li in the blanket. The construction oi thetalte up roller forms no part oli my invention and may be of anyWQlll-IllOWIl form.

It: will be observed that by my invention the holding plate l3 isdisposed radially with respect to the cylimler and thus occupiesaminimum space. Hence the width ol the slot ll may be such that the pinsill on the plate will jtnt clear the blanket wound up on the talte-uproller ll hile l have illustrated and described a preferred embodimentot my invention, 1 consider myself at liberty to main: such changes .inconstruction, form and arrange ment. oi' various parts as fall withinthe delinition ol' the 'l'ollowing claims:

l claim:

l. in combination with a printing cylinder having an axially disposednotch formed in the periphery lhcreo'l, attaching means within the notchto which one end ot a. hlanlrct may be secured, means in the notch bywhich the opposite end ol the blanket may be drawn taut, said attachingmeans being mounted to slide substantially radially without the notch,and means for locking said attaching means in depressed position.

2. ln coinbihation with a printing cylinder having an axially disposednotch formed in the periphery thereof, a blanket holder comprising aplate mounted to slide inwardly and outwardly in the notch, attachingmeans carried by the plate, a spring tending to force the plate outward,whereby the attaching means will project beyond the peripheral face ofthe cylinder, and means for locking the plate in depressed positionlncombination with a printing cylinder l'lavine an axially disposed notchformed in the periphery thereof, a blanket holder coniprising a platemounted to slide radially in the notch, hooh's carried by the plate, aspring tending to lorce the plate outward. whereby the hoolis willproject beyond the peripheral lace ol' the cylinder, and mean; forlocking the plate in deprrsscd position.

l. in combination with a printing cylinder harng an axially disposednotch .lormcd in the periphery thereof, a plate mounted to slideradially in the notch, hoolo; carried by the plate and adapted to engageone end of a blanliet, a spring tending to lorre the plate outward,whereby the books will projci-t beyond the peripheral l'arc oi thecylinder, means for locking the plate in deprcswd position and a tahwurroller in the notch about whicl the opposlle end ol the blanlnt may bewound.

5. In combination, a printing cylinder formed with an axilly disposednotch in the periphery thereof, the notch having a substantially radialwall, a plate, hooks carried by the plate. means For holding said platein radially slidable engagement with said wall, a. spring tending toforce the plate ontward to a position in which the hooks will projectbeyond the peripheral l'ace ol the cylinder, and means for locking theplate in deprcsstnl position. i

6. In combination, a printing cylinder formed with an axially disposednotch in th periphery thereof, the notch having a Jilin stantiallyradial wall. a plate. l'orm d with bayonet slots, headed pins engagingthe ,lUlc: respectively and securing the plate in radially slidableengagement with said wall, hooks carried by the plate, a spring lend ingto slide the plate outward to a position in which the books will projectbeyond the peripheral face of the cylinder, and means tending to pressthe plate endwisc when the plate is depressed, whereby the pins willenter the oll'set portions of the bayonet slots and lock the plate indepreseed position.

7. In combination, a printing cylinder formed with an axially disposednotch in the periphery thereof, the notch having a substantially radialwall, a plate formed with bayonet slots, headed pins engaging the slotsrespectively and securing the plate in radially slidalole engagementwith said wall. hooks carried by the plate. the bottom of the notchbeing formed with a groove, a V shaped spring, means for securing thespring to the plate, the free ends of the spring engaging the groore andtending to slide the plate outward to a position in which the hooks willproject from the peripheral tare of the cylinder, and another springtcudinp to press the plate endwisc when the latter is depressed, wherebythe pins will enter the offsets of the bayonet slots and lock the Plilllin depressed position.

8.111 combination. a printing-r cylinder formed with an axially disposednotch in lllfi the periphery thereof, the notch having a substantiallyradial wall, a plate formed with slots, headed pins engaging the slotsrespectively and securing the plate in radially slidable engagement withsaid wall, hooks carried by the plate, a spring tending to slide theplate outward to a position in which the hooks will project beyond theperipheral face of the cylinder, each of said slots having a radialportion and a lateral offset at the outer end of the radial portion andan outwardly projecting shoulder at the junction of the radial portionand the offset, and means for causing the plate tomove endwise when itis depressed, whereby the pins will enter said offsets, holding theplate in depressed position and the shoulders will lock the plateagainst endwise movement.

9. In combination, a printing cylinder formed with an axially disposednotch in the periphery thereof, a plate formed with bayonet slots,headed pins engaging the slots respectively and securing the plate inslidable engagement with one of the side walls of said notch, hookscarried by the plate, a spring tending to slide the plate outward to aposition in which the hooks will project beyond the peripheral face ofthe cylinder, the plate being formed at one end with a projecting ear,and another spring mounted in the notch in the path of said ear, wherebywhen the plate is depressed the latter spring will engage the ear,tending to move the plate endwise so that the pins will enter the offsetportions of the bayonet slots and lock the plate in depressed position.

10. In combination, a printing cylinder formed with an axially disposednotch in the periphery thereof, the notch having a substantially radialwall, a plate formed with bayonet slots, headed pins engaging the slotsrespectively and securing the plate in radially slidable engagement withsaid wall, hooks carried by the plate and adapted to engage one end of ablanket, a take-up roller in the notch about which the other end of theblanket is adapted to be wound, a spring tending to slide the plateoutward to a posioffset portions of the bayonet slots and lock the platein depressed position.

11. In combination, a printing cylinder formed with an axiallly disposednotch in the periphery thereof and with an undercut groove in one of theside walls of the notch, a rail slidable endwise in the groove, meansfor securing the rail in fixed position in the groove, a plate formedwith bayonet slots, headed pins engaging the slots respectively andsecuring the plate in slidable engagement with the rail, hooks carriedby the plate, a spring urging the plate outwardly to a position in whichthe hooks will project from the peripheral face of the cylinder, andmeans for caus'ingthe plate to move endwise when it is depressed wherebythe pins will enter the offset portions of the bayonet slots and holdthe plate in depressed position.

In witness whereof, I hereby afiix my signature this 16th day of March,1927.

FRANK B. SHEA.

